Sawmill shock-absorber.



G. H. HAMILTON.

SAWMILL SHOCK ABSORBER.

APPLICATION FILED IULY 2&1915. 1., 1&9]. Patented Apr. 25, 1916.

2 SHEETS*SHEET 1.

lNl/E/VTOR V 6. ff fiamz'lin ya. By r f ATTOBIVES G. H. HAMILTON.

, SAWMILL SHOCK ABSORBER.

APPLICATION FILED .IULY 28,19I5.

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WI T/I/ESSES I I I ATTORNEYS GEORGE H. HAMILTON, OF PORTLAND, OREGON.

SAWMILL SHOCK-ABSORBER.

iaeoeie.

Specification of Letters Patent.

Patented Apia25, 1916.

Application filed July 28, 1915. Serial No. 42,280.

To all whom it may concern:

Be it known that I, GEORGE H. HAMIL- TON, a citizen of the UnitedStates, and a resident of Portland, in the county of Multnomah and Stateof Oregon, have invented a new and Improved Sawmill Shock-Absorber, ofwhich the following is a full, clear, and exact description.

My invention relates to a shock absorber for saw mills, and which isadapted to receive the cants sawn oif from the logs by the mill and tolower said cants to the delivery rollers. I

An object of the invention is to provide a simple and inexpensive shockabsorber for saw mills which will prevent the cants from striking thedelivery rollers and there by causing injury to the rollers, thefoundation of the mill, and also to the part of the cant projectingbeyond the end of rollers.

A further object of the invention is to provide a shock absorber formills in which an air dash-pot is utilized to gradually lower the cantsto the delivery rollers.

Vith the above and other objects in view, the nature of which will morefully appear as the description proceeds, the invention consists in thenovel construction, combmation and arrangement of parts as herein fullydescribed, illustrated and claimed.

In the accompanying drawmgs, formmg part of .the application, similarcharacters of reference indicate corresponding parts in all the views.

Figure 1 is a vertical section on line 11, Fig. 8, through a millembodying my invention; Fig. 2 is an enlarged section through the dashpot; and Fig. 3 is a section on lme 3 3, Fig. 1.

Referring to the drawings, 4 is the log carriage of the saw mill, whichtravels over tracks 5 provided on the saw-mill platform 6. Located onthe platform to one side of the tracks is a delivery roller case 7 inwhich, at suitable intervals, the delivery rollers 8 are mounted and onto which the lumber cants 9 are delivered by the mechanism forming myinvention and described below.

Suitably spaced delivery arms 10 are pivotally connected within theroller case 7 by means of brackets 11, each of which is secured to theinside back of the roller case 7, and to which bracket the lower end ofthe corresponding arm is pivotally connected.

A portion 12 of each arm, adjacent the upper end, 1s serrated to preventthe lumber cants from slipping. The serrated portions 12 of the arms areat about an angle of 15 to the horizontal when said arms ar placed intooperative position by a dash-pot 13, which is plvotally mounted betweenits ends within the frame of the mill through the medium of a clamp 14which has trunnions 15 engaging bearings mounted within the frame.

The piston-rod 16 of the dash pot is connected to one end of a beam 17which is keyed to a shaft 18 mounted to rock on suitable bearings 19provided in the mill frame. The other end of the beam is pivotallyconnected to one of the arms 10 by a rod. 20, and a similar rod connectsthe other arms pivotally to a crank 21 rigidly secured to the shaft 18.A heavy piston 22 is secured to the piston rod 16. The weight of thepiston balances the connections and the arms when the arms are inoperative position and causes said arms to move from the inoperative tothe operative position. The additional weight on the arms will cause thepiston to rise within the pot 13.

The pot, which is a tubular member, has a head 23 at the upper endthereof through which the piston rod 16 projects. Encompassing the rodand secured to the head within the pot is a leather cup 24 adapted toprevent the passage of air between the head 23 and the rod 16 when thepiston 22 moves toward the head. The cylinder head 28 is provided with avalve 25 which controls the outlet from the pot and whereby the speed ofthe piston 22 within the pot is controlled. The piston 22 has a throughbore 26 in whichfa valve 27 is mounted to prevent the escape of airtherethrough when the piston moves toward the head but which valve 27will allow the entrance of air into the pot through the piston when saidpiston moves away from the head. It will be noted that the lower end ofthe pot is open. A leather gasket 28 is provided on the piston 22 tomake the same air tight when the piston moves toward the head. Toprevent the valve 27 from being displaced out of the bore 26, the stemof the valve is provided with a slot 29 through which projects a pin 30inserted into the piston through the lateral surface thereof.

To maintain the arms in the inoperative position, a pivotal latch 31 isprovided which is by gravity maintained in the path of travel of a lug32 provided on one of the arms and which lug is adapted to snap into thecatch when the serrated portions 12 of the arms are below the uppersurface of the rollers 8. This engagement of the lug 32 p with the latch31 maintains the piston 22 at the upper end of the pot 13 and preventsgravity from causing the piston 'to move downward and therefore bringthe arms to their operative position. To disengage the latch 31 from thelug 32 a rocking cam 33 is located adjacent the latch 31. The 'cam isoperable by-a pedal 34. By pressing on the pedal the latch 31 is causedto disengage the lug 32, thus allowing the piston 22 to descend underthe action-of gravity, consequently raising the arms to their operativeposition, as shown in full lines in Fig.

1. c To restore the camto the normal or operative position, acounterweight 35 is provided and the movement of which counterweightunder the action of gravity is limited rby'the engagement of the pedal34 with the by the displacement of the valve 27.

I of the piston 22.

' cant which will roller case .7.

-When the lumber cant is being sawed from the log the off bearerreleases the receiving arms 10by pressing the pedal 34,

when it will rise-t0 the position shown in Fig. l-under thegravitational displacement The downward movement of the piston will notbe retarded, as the entrance of air into the dash-pot is facilitatedarms, being in the operative position, will receive the cant as it isdropped from the log and ease it to the rollers 8 without jar becausethe upward movement of the piston 22 within the pot fact that the escapeof air from the'dashpot is restricted by means of the valve 25;"

Due to the gradual lowering of the cant on to the rollers 8 all shocksto the rollers and to the foundation of the mill are'eliminated.

Shock to the'cant is also eliminated thereby, and consequent injury tothat portion of the project beyond the ends of the rollers 8. Y

As the arms 10 move downward under the weight of the cant the lug 32comes into engagement with the latch 31 and the arms Copies of thispatent may, be obtained for five cents each, by addressing the The l isgradual, in view of the will be maintained in inoperative position untilanother cant is nearly sawn off from the log, when the operator willrepeat the operation.

While I have described the principle of operation, together with thedevice which I now consider to be the best embodiment thereof, I desireto have it understood that the device shown is merely illustrative andthat such changes may be made as are within the scope of the appendedclaims.

I claim:

1. In combination with the delivery rollers of a saw mill, a shockabsorber therefor comprising means mounted to swing to and from therollers, gravitationally-operable means associated with said first meansfor swinging the same from the rollers, and aircushioning means foreasing the movement of said first means toward the rollers.

2. In combination with the delivery rollers of a saw mill, a mechanismfor delivering cants to the rollers, delivery arms mounted to swing toand from the rollers, means normally tending to swing said arms from therollers, air-cushioning means for easing the swinging movement of saidarms toward the rollers, means for locking said arms when they are swungto the rollers, and means for unlocking said arms.

3. In combination with the delivery rollers of a saw mill, delivery armsmounted to move to and from the rollers, gravitationally-operable meanstending to move said arms from the rollers, air-cushioning means foreasing the movement of the arms to the rollers, means for locking thearms when the same are brought to the rollers whereby thegravitationally-operable means are prevented from moving the arms fromthe rollers, and means for unlocking the arms whereby thegravitationally-operable means are rendered operative.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE H. HAMILTON.

Witnesses:

W. W. MoIN'rosH, GEo. L. DAVIS.

"Commissioner of Patents,

Washington, D. 0.

